2015 solano county water agency urban water management … scwa... · 2020-03-17 · urban water...

SOLANOCOUNTYWATERAGENCY

2015 Solano County Water Agency URBAN WATER MANAGEMENT PLAN

August 2016

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CHAPTER 1 –INTRODUCTION ................................................................................................................. 4 CHAPTER 2 – PLAN PREPARATION ....................................................................................................... 4 CHAPTER 3 – SYSTEM DESCRIPTION ................................................................................................... 6

Service Area Information with 20 Year Projections ................................................................................. 7 Climatic Information. ................................................................................................................................ 8

Solano County ETo ............................................................................................................................... 8 Average Rainfall .................................................................................................................................... 9 Average Temperatures ......................................................................................................................... 10

CHAPTER 4 – SYSTEM WATER USE .................................................................................................... 10 Water Use by Customer Type ................................................................................................................. 10

CHAPTER 5 – BASELINE AND TARGETS ............................................................................................ 13 CHAPTER 6 – SYSTEM SUPPLIES ......................................................................................................... 13

Water Sources .......................................................................................................................................... 13 SCWA Water Supply Projections ........................................................................................................... 15 Transfer and Exchange Opportunities ..................................................................................................... 16 Development of Desalinated Water ......................................................................................................... 16 Recycled Water Plan ............................................................................................................................... 16 Wastewater Quantity, Quality and Current Uses .................................................................................... 16 Potential and Projected Use, Optimization Plan with Incentives ............................................................ 17 Future Water Supply Projects and Programs ........................................................................................... 17

CHAPTER 7 – WATER SUPPLY RELIABILITY AND WATER SHORTAGE CONTINGENCY PLANNING ................................................................................................................................................. 18

Projected Normal Water Year Supply and Demand ................................................................................ 18 State Water Project Supply ...................................................................................................................... 18

North of Delta Allocation .................................................................................................................... 18 2014 SWP Water Supply Allocation ................................................................................................... 20

Solano Project Supply ............................................................................................................................. 23 WATER SHORTAGE CONTINGENCY PLAN ................................................................................... 26

Stages of Action .................................................................................................................................. 26 Estimate of Minimum Supply For Next Three Years ......................................................................... 27

Catastrophic Supply Interruption Plan .................................................................................................... 28 Solano Project ...................................................................................................................................... 28 State Water Project .............................................................................................................................. 29 Prohibitions, Penalties and Consumption Reduction Methods ........................................................... 29

Analysis of Revenue Impacts of Reduced Sales During Shortages ........................................................ 29 Solano Project ...................................................................................................................................... 29 State Water Project .............................................................................................................................. 29

Draft Ordinance and Use Monitoring Procedure ..................................................................................... 30 Solano Project ...................................................................................................................................... 30 State Water Project .............................................................................................................................. 30

WATER QUALITY IMPACTS ON RELIABILITY ............................................................................. 30 State Water Project .............................................................................................................................. 30 Solano Project ...................................................................................................................................... 30

CHAPTER 9: DEMAND MANAGEMENT MEASURES ........................................................................ 32 Wholesale agency programs .................................................................................................................... 32

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CHAPTER 1 –INTRODUCTION The Solano County Water Agency (SCWA) is a wholesale water agency that provides untreated water to cities and agricultural districts in Solano County from the Federal Solano Project and the North Bay Aqueduct of the State Water Project. SCWA is not an urban water supplier as defined by the Water Code and is not required to submit an Urban Water Management Plan (UWMP) but is doing so on a voluntary basis. The Agency views the UWMP as a valuable planning tool and continues to update it to keep the Plan current and relevant. Retail agencies within Solano County that are required to submit an UWMP will do so individually. Other documents related to the UWMP are the Solano Agencies’ Integrated Regional Water Management Plan (February 2005) and the SCWA Water Management Plan (September 2014), the latter prepared to meet the requirements of our federal water supply from the Solano Project. The SCWA Water Management Plan was prepared in conformance with guidelines prepared by the United States Bureau of Reclamation (USBR).

CHAPTER 2 – PLAN PREPARATION In preparing the UWMP, SCWA coordinated with appropriate agencies. Table 1 lists those agencies. Table 1. Coordination with Appropriate Agencies

Coordinating Agencies

Participated in UWMP

Development

Commented on the Draft

Report

Attended Public

MeetingsContacted for

Assistance

Sent Copy of the Draft Report

Sent Notice of Intention to

Adopt

Not Involved/No Information

City of Vallejo X X X

City of Fairfield X X X X

City of Suisun City X X X

City of Benicia X X X

City of Vacaville X X X

City of Rio Vista X X XCalifornia Water Service Company X X

City of Dixon X X X

Solano Irrigation District X X X

Suisun Solano Water Authority X X X

Dixon Solano Municipal Water

Service X X X

Solano County XX X

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Additionally, SCWA participates in San Francisco Bay Area regional water management discussions and participated in the development of a Bay Area Integrated Regional Water Management Plan (IRWMP). The Agency is also a member of the Sacramento Valley Westside IRWMP. Extensive discussions were held with SCWA member agencies on the water supply assumptions for the State Water Projects Supply and Solano Project Supply. SCWA uses a wide variety of water management tools and options to maximize resources and minimize the need to import water. As previously mentioned, SCWA has completed an Integrated Regional Water Management Plan, a USBR Water Management Plan and is participating in both the Bay Area Integrated Water Management Plan as well as the Sacramento Valley Westside IRWMP. SCWA and its member agencies have comprehensive urban and agricultural water conservation programs. Water exchanges and transfers are documented in the Solano Agencies’ Integrated Regional Water Management Plan. These exchanges and transfers within Solano County maximize local resources and minimize the need for additional new imported water supplies. However, longer term projections show there may be a need for additional imported water supplies. An e-mail notification that SCWA was reviewing and considering amendments or changes to its Urban Water Management Plan was sent on June 9, 2016 to all entities that are provided water from the Agency. Exhibit 1 is a copy of the action of the Board of Directors of the Solano County Water Agency adopting the UWMP Any questions or comments regarding the Solano County Water Agency UWMP should be directed to: Andrew Florendo Water Conservation Coordinator 810 Vaca Valley Parkway, Ste. 203 Vacaville, CA 95688 [email protected]

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CHAPTER 3 – SYSTEM DESCRIPTION

Figure 1. Solano County showing the seven incorporated cities. According to the U.S. Census Bureau, Solano County has a land area of 829 square miles and water area of 78 square miles. San Francisco Bay, Suisun Bay, the Carquinez Straits and the Sacramento River provide the county with natural borders to the south and west. The county also contains the Suisun Marsh, which is the largest contiguous brackish water wetland in the western United States and is a protected habitat. The boundaries of Solano County were set on February 18, 1850 by the first elected legislature of the territory of California, making Solano County one of the original 27 counties. There are seven cities in the

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county as well as a major military installation – Travis Air Force Base. Two of the county's seven cities, Benicia and Vallejo, served as the State's Capital in the early 1850s. In 1984 the voters of the county passed the Urban Growth Initiative, Measure A, which limits most urban growth to incorporated cities. Subsequent elections extended the mandates from the original Urban Growth Initiative to the present. As a result 95% of Solano County residents live within the county’s seven cities compared to a statewide average of 83%. Additionally, the cities of Vallejo and Benicia have limited geographical area to expand and growth in these areas is expected to be small. The other cities, Fairfield, Vacaville, Suisun City, Dixon and Rio Vista are expected to continue to see increases in population in the future as there is suitable land available for urban growth. Rich agricultural land lies in the northern part of the county while rolling hills are part of the southern area. Approximately 131,000 acres is comprised of irrigated crop land. In 2013, Solano County ranked 27th out of 58 counties in gross value of agricultural production. The county ranked first among California counties in triticale production and second in wheat and seed production. And third in Sudan grass hay, sheep and lambs and fourth in the production of sunflowers. Agricultural water use is expected to remain constant as there are some new areas coming under irrigation, but there is an off-setting amount of agricultural land being replaced by urban growth. There are other demographic features affecting water management such as housing density, future commercial and industrial development, or projected income levels. The UWMP’s for the cities contain more detail on growth projections and factors that are impacting urban growth.

Service Area Information with 20 Year Projections Table 2 and Figure 2 shows current and projected population for the SCWA service area which includes all of Solano County. These data are Solano County projections provided by the California Department of Finance. Table 2. Population – Current and Projected Source:CaliforniaDepartmentofFinance. TotalPopulationProjectionsforCaliforniaandcounties. July1,2015to2060 infiveyearincrements. 2015 2020 2025 2030 2035 SCWA Service Area Population

429,400 454,800 477,500 501,500 526,500

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Figure 2. Solano County Population – Historic and Projected

Climatic Information. Solano County climate varies spatially depending mainly on the effects of topography on rainfall distribution. The eastern parts of the County (Sacramento Valley/Sacramento and Suisun Bay watersheds) are classified as having a Mediterranean/hot summer climate while the western portions (Napa River/San Pablo Bay watersheds) are characterized by a Mediterranean/cool summer climate.

Solano County ETo Solano County lies within two hydrologic regions with the western part of the county in the San Francisco Bay Region and the eastern portion in the Sacramento River Region. Since Solano County is part of two hydrologic regions it is not feasible to list an “average” reference evaporation (ETo) for the entire county. The eastern portion of the county has similar climatic conditions to the Sacramento Valley and is characterized by mild winters and hot summers with periods of above 90 °F days. In contrast, the southern and western sections have more in common with the San Francisco Bay Area. The two cities in south county, Benicia and Vallejo, have inland coastal maritime climates typified by cool, wet winters with significant periods of fog and warm, dry summers with frequent cooling sea breezes. Fairfield, due to its

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100,000

200,000

300,000

400,000

500,000

600,000

1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 2025 2030 2035

Figure 2. Historic and Projected Population of Solano County

Historic and Current Population Projected Population

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location near the dividing line between the San Francisco Bay Region and the Sacramento River Region, has average climatic conditions that lie between the two. This is borne out by an examination of annual ETo data (Figure 3). Dixon, located in eastern Solano County has an annual ETo of 52.1, comparable to Sacramento at 51.9. In southwest Solano County, Benicia has an annual ETo of 40.3 which is similar to the Oakland foothill’s annual ETo of 39.6. Fairfield’s annual ETo of 45.2 is halfway between that of Dixon and Benicia.

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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v

g

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Figure 3. Solano County Average Monthly ETo

Dixon Benicia Fairfield

Average Rainfall The average annual precipitation in the eastern lowland areas of Solano County is typically between 15 and 25 inches, with higher rainfall amounts reaching 25 to 40 inches in the western hills. Average rainfall for selected Solano County cities is shown in Figure 4. Obviously, the five years from 2011 – 2015 have not been typical when compared to past years.

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Figure 4. Average Monthly Rainfall

Benicia Fairfield Vacaville Dixon

Figure 4. Average Monthly Rainfall for Selected Solano County Cities

Average Temperatures Solano County temperatures range from an average of 45 °F in January to mid-70s °F in July. During summer months (June to September) eastern portions of the county may experience several days where temperatures exceed 90 °F.

CHAPTER 4 – SYSTEM WATER USE

Water Use by Customer Type SCWA has three categories of customers: cities, agricultural districts and institutions. SCWA has a contract with DWR for water supply from the SWP. In turn, SCWA has contracts with Solano cities for provision of this water supply. The NBA contracting cities are: Benicia, Vacaville, Fairfield, Vallejo, Suisun City, Rio Vista and Dixon. The city of Suisun City has an allocation of NBA water but has no facilities to take NBA water at this time. The cities of Rio Vista and Dixon have the right to obtain a specified amount of NBA water in the future, but have no facilities to take NBA water at this time. SCWA has water contracts to deliver Solano Project water to the cities of Fairfield, Suisun City, Vacaville, and Vallejo. SCWA also has contracts with two agriculture water customers, the Solano Irrigation District and Maine Prairie Water District.

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The institutions served by SCWA are the University of California at Davis (UCD) and the California State Prison – Solano (CSP-Solano). UCD receives an allocation of Solano Project Water which is used for agriculture on university property. Most of the water delivered to CSP-Solano, approximately 85%, is used mostly within the facility and the remaining 15% is used for agricultural purposes on some surrounding land. Solano County Water Agency is strictly a wholesaler of untreated water. The Water Agency does not own or maintain any meters. By agreement all functions relating to meters and leak detection is the responsibility of our member units. All SCWA water supplies are metered by our member units. Table 4 shows past, current and projected water deliveries in five year increments from year 2010 to 2035. Years 2010 and 2015 are based upon actual deliveries. Note that since SCWA is a wholesale supplier, member unit cities have other supplies that they can use to meet their future demands. Those will be shown in each of their individual UWMP’s. There are no water sales to any entities other than those listed in Table 4.

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Table 4. Past, Current and Projected Water Deliveries – All SCWA Supplies are Metered Units are in acre-feet.

Year 2010 (a) 2015 (a) 2020 2025 2030 2035Name of Agency Water Source

Benicia Solano Project 1,994 2,768SWP 8,231 6,538 13,815 13,815 13,815 13,815Total : 10,225 9,306 13,815 13,815 13,815 13,815

Cal State Prison - Solano Solano Project 815 737 1,191 1,191 1,191 1,191

Fairfield Solano Project 13,203 12,980 9,132 9,132 9,132 9,132SWP 7,993 5,701 11,789 11,789 11,789 11,789Total : 21,196 18,681 20,921 20,921 20,921 20,921

Maine Prairie Water

District Solano Project 10,318 16,172 14,890 14,890 14,890 14,890Suisun City Solano Project 4,041 2,981 1,588 1,588 1,588 1,588

SWP 1,044 1,044 1,044 1,044Total : 4,041 2,981 2,632 2,632 2,632 2,632

Solano Irrigation District Solano Project 114,031 130,575 139,963 139,963 139,963 139,963

University of California -

Davis Solano Project 1,145 1,397 3,971 3,971 3,971 3,971Vacaville Solano Project 3,971 6,400 5,708 5,708 5,708 5,708

SWP 7,575 1,872 7,211 7,211 7,211 7,211Total : 11,546 8,272 12,919 12,919 12,919 12,919

Vallejo Solano Project 14,672 8,184 14,493 14,493 14,493 14,493SWP 7,087 9,725 4,498 4,498 4,498 4,498Total : 21,759 17,909 18,991 18,991 18,991 18,991

TOTAL : 195,076 206,030 228,249 228,249 228,249 228,249(a) Actual deliveries

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CHAPTER 5 – BASELINE AND TARGETS SCWA fully supports the existing and planned efforts of its member agencies to comply with the provisions of SBx 7-7. SCWA has and will continue to provide financial and technical assistance to Solano County cities and irrigation districts to implement programs for both urban and agricultural water conservation. Funding for water use efficiency programs are an integral part of the water agency’s operating budget. The Water Agency has taken the lead role in the coordination and implementation of regional water use efficiency measures for both residential and commercial accounts in Solano County. This is an ever evolving role designed to adapt to both political and environmental conditions. SCWA has been an active member of the California Urban Water Conservation Council (CUWCC) since the organization was founded in 1991. Since 2007, SCWA has worked with its member agencies and implemented regional programs that offer financial incentives to Solano County residents to install High-Efficiency Toilets (HETs), High-Efficiency Washing Machines (HEWs), and to replace high water use turf with climate appropriate, sustainable, water-efficient landscaping. The Water Agency and its member units have also implemented a “Water Savings Incentive Program” designed to encourage Commercial, Institutional, and Industrial (CII) customers to install water saving devices. In 2015, SCWA conducted an assessment of the effectiveness of its residential water conservation programs. The objective of this study was to assist SCWA in gaining a greater understanding of single-family residential water use throughout the SCWA service area, evaluate the effectiveness of SCWA’s water conservation programs, and identify remaining water conservation potential in the SFR sector. A copy of the executive summary is included as Appendix C. The full report is available at: http://www.scwa2.com/about-us/publications In 2016, SCWA will implement two new programs on a pilot scale basis. The first is a program aimed at bringing water efficient devices to senior and low-income households that would otherwise be unable to install them. The other water conservation program is called “Free Sprinkler Nozzles”. SCWA will partner with Western Municipal Water District to offer free high-efficiency sprinkler nozzles to Solano County homeowners and businesses. The objective of this program is to reduce outdoor water use among Water Agency customers by improving the efficiency of customer irrigation systems.

CHAPTER 6 – SYSTEM SUPPLIES

Water Sources SCWA serves as a water wholesaler for the Solano Project and the State Water Project (SWP). The Solano Project is a federal project with the Bureau of Reclamation (USBR) that stores water in Lake Berryessa for delivery to users throughout the region. Local agencies and USBR first conceived the project in the 1940s

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and 1950s to meet the increasing water demands of agriculture, municipalities, and military facilities in Solano County. Additionally, the Solano Project was also intended to offset groundwater depletion The Solano Project first delivered water in 1959. The major facilities are:

Monticello Dam, which captures water from Putah Creek in Lake Berryessa; Putah Diversion Dam, which diverts water out of Lower Putah Creek just downstream of Monticello

Dam; and Putah South Canal, which delivers water to local agencies. The Putah South Canal is 33 miles long,

concrete lined and has a maximum capacity of 956 cubic feet per second. SCWA has contracts to deliver Solano Project water for municipal and agricultural uses to Fairfield, Suisun City, Vacaville, Vallejo, Solano Irrigation District, Maine Prairie Water District, University of California at Davis, and California State Prison – Solano. The SWP has rights to water originating from the Sacramento and San Joaquin Rivers, and it stores water in Lake Oroville (on the Feather River). The SWP provides water to SCWA through the North Bay Aqueduct (NBA). SCWA has a long-term water master water supply contract with DWR for water supply from the State Water Project that currently expires in 2035 but is renewable. SCWA is a North of Delta SWP Contractor and receives SWP water via the North Bay Aqueduct (NBA). The NBA is a 27-mile long pipeline that delivers untreated municipal water from Barker Slough in the Sacramento-San Joaquin delta to Napa and Solano Counties. The NBA is owned and operated by DWR to deliver wholesale water supply for Municipal and Industrial uses from the Barker Slough Pumping Plant in the Sacramento-San Joaquin Delta to Napa and Solano Counties. SCWA’s contract with DWR includes a maximum Table A amount of 47,756 acre-feet per year (AFY). Supplemental SWP water, “Advanced Table A” (ATA), under specific conditions, is available to SCWA from year to year. Additional supplemental water, Settlement Water, is also available under specific conditions. As mentioned in the preceding paragraph, SCWA has a contract with DWR for water supply from the SWP. In turn, SCWA has contracts with Solano cities for provision of this water supply. The NBA contracting cities are Benicia, Vacaville, Fairfield, Vallejo, Suisun City, Rio Vista, and Dixon. The city of Suisun City has an allocation of NBA water but has no facilities to take NBA water at this time. The cities of Rio Vista and Dixon have the right to obtain a specified amount of NBA water in the future, but have no facilities to take NBA water at this time. SCWA has contracted for an ultimate allocation of 47,756 acre-feet of water per year from the SWP. Table 5 shows the two water supply sources for SCWA: the USBR Solano Project and the SWP. The contracted water supply (plus operational losses) for the Solano Project total 207,350 acre feet per year. This roughly matches USBR’s calculation of “firm yield”. Firm yield is the calculated amount of water supply available during the driest hydrologic period of record for the project. The table shows contract amounts and does not reflect potential deficiencies in supplies due to drought and other conditions. SCWA does not provide groundwater supplies nor does it provide any other water supplies beyond the two wholesale sources. See each individual city’s UWMP for details about other supplies used in Solano County. The most recent copies of each cities’ UWMP is available at: http://www.scwa2.com/about-us/publications.

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Table 5. Current and Planned Water Supplies – AF/Y Water Supply Sources 2015 2020 2025 2030 2035

Wholesale water

providers

USBR Solano Project 207,350 207,350 207,350 207,350 207,350

DWR State Water

Project 47,756 47,756 47,756 47,756 47,756

Supplier produced

groundwater

Supplier surface

diversions

Transfers in or out

Exchanges in or out

Recycled water (current

and projected use)

Desalination

Other

SCWA Water Supply Projections SCWA has provided information to our retailing agencies about the availability and reliability of our wholesale supplies - the State Water Project and Solano Project. Table 6 shows SCWA water supply availability of its two main water sources.

Table 6. Existing Water Supply Sources in Normal Water Years 2015 2020 2025 2030 2035

State Water Project (a) 34,869 34,869 34,869 34,869 34,869 Reliability 73% 73% 73% 73% 73%

North of Delta Allocation 3,487 3,487 3,487 3,487 3,487 Reliability 10% 10% 10% 10% 10%

Solano Project 205,825 205,825 205,825 205,825 205,825

Reliability 99% 99% 99% 99% 99% (a) North of Delta Allocation as an additional percentage of SCWA's Table A Allocation, estimated based on actual

amounts received since the implementation of the North of Delta Settlement in 2014. Because of the limited historical data, this estimate is preliminary and will be adjusted for subsequent UWMP updates as additional data becomes available.

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Transfer and Exchange Opportunities

SCWA, as a wholesaler, does not conduct exchanges or transfers on its own. SCWA does facilitate and assist cities and districts in transfers and exchanges. A thorough discussion of current transfers and exchanges is included in Appendix A of the 2005 Solano Agencies’ Integrated Regional Water Management Plan available at: http://www.scwa2.com/about-us/publications

Development of Desalinated Water There are potential opportunities for development of desalinated water in Solano County including waters from the San Francisco Bay and treated wastewater. Some wastewater in Solano County has a high salt content which makes recycling difficult. One of SCWA’s member units, the City of Vacaville, is considering a desalination process as part of a wastewater recycling project. Currently there are no planned desalination projects in Solano County. They could be pursued if grant funding becomes available or other actions are taken to improve the economics of such projects. The Agency does not have any quantification about the potential volume of desalinated water available from these types of projects.

Recycled Water Plan Solano County Water Agency does not collect, treat, produce or distribute recycled water and has no involvement in wastewater treatment or water recycling. Recycled water treatment and distribution is managed by the cities and wastewater special districts within the county. For details of wastewater collection and treatment systems, quantities treated, excess recycled water capacity not currently being distributed to non-potable customers, and type, place, and quantity of use, refer to the individual cities UWMP’s available at: http://www.scwa2.com/about-us/publications. Recognizing that recycled water can be an important component of the county’s complete and balanced water supply program, SCWA has incorporated its use by the cities into the 2005 Solano Agencies’ Integrated Regional Water Management Plan. However, the Solano Agencies have decided that any discussion regarding specific details on recycled water use should be conducted in the cities’ individual UWMPs. SCWA is committed to continually supporting the search for safe, economically feasible and publicly acceptable methods to increase local water resources by maximizing the use of recycled water. The Agency will continue to work cooperatively with the cities towards that end.

Wastewater Quantity, Quality and Current Uses Currently, within Solano County, the city of Fairfield has the most active wastewater recycling program. Wastewater in that city is treated at a facility operated by the Fairfield-Suisun Sewer District (FSSD). The

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facility has been treating wastewater to a tertiary level since the 1970’s. In 2002, Fairfield entered into an agreement with FSSD and the Solano Irrigation District that will provide Fairfield with a potential of up to 12 million gallons per day of effluent for a recycled water supply. The FSSD presently provides a limited amount of recycled water to sites near the FSSD facility for irrigation and industrial purposes. Distribution facilities would need to be constructed to serve additional non-potable sites. The City of Vacaville owns and operates the Easterly Wastewater Treatment Plant, a tertiary treatment and blending elimination facility with a dry weather flow capacity of 15 MGD. Currently, treated effluent is discharged into Alamo Creek which flows into Cache Slough. A portion is used for irrigation by the Solano Irrigation District and the Maine Prairie Water District. Vacaville also offers treated effluent free of charge to construction firms for dust control and other construction activities outside of city limits. The cities of Benicia and Vallejo discharge treated wastewater into the Carquinez Strait. For additional details of each cities’ wastewater collection and treatment systems, quantities treated, excess recycled water capacity not currently being distributed to non-potable customers, and type, place, and quantity of use, refer to the individual cities UWMPs.

Potential and Projected Use, Optimization Plan with Incentives Within SCWA’s service area a number of potential uses for recycled water have been identified, including increased landscape and agricultural irrigation, fire protection, industrial use (cooling towers at the Valero refinery), construction, wetlands and wildlife habitat, and other miscellaneous uses. Some of these are already in existence or, like the Valero refinery cooling towers, are in the planning stage. Other uses have not been implemented because the capital infrastructure, for example, treatment facilities and distribution systems, have not been built to accommodate such use. See individual city UWMP’s for additional and more detailed information.

Future Water Supply Projects and Programs The February 2005 Solano Agencies’ Integrated Regional Water Management Plan (IRWMP) identifies numerous water supply projects and programs to be considered for implementation. The direction in the IRWMP is to look at groundwater conjunctive use as a potential way of addressing dry year shortages. None of these conjunctive use projects have been developed enough to be classified as a “planned water supply project”. Water supply projections that SCWA provided to each retail water supplier are shown as Appendix A and B. Table 7 shows additional water uses and losses. The only category currently applicable to SCWA is “Unaccounted for System Losses” that are the losses associated with the Putah South Canal delivery of Solano Project water.

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Table 7. Additional Water Uses and Losses – AF/Year

Water Use 2015 2020 2025 2030 2035 Saline barriers Groundwater recharge Conjunctive use Raw Water Recycled Other (define) Unaccounted for system losses 15,000 15,000 15,000 15,000 15,000 Total 15,000 15,000 15,000 15,000 15,000

CHAPTER 7 – WATER SUPPLY RELIABILITY AND WATER SHORTAGE CONTINGENCY PLANNING

Projected Normal Water Year Supply and Demand This section presents a separate analysis of the SWP and Solano Project water supplies. Separate analysis is necessary because member agencies of SCWA do not all have both water supplies, so they will need a separate analysis in order to prepare their UWMP’s.

State Water Project Supply The amount of water that is allocated and delivered by the SWP to each contractor during a year under SWP contract is determined annually by DWR. Table A Amounts determine the maximum amount of water a contractor may request in any year from DWR. SWP allocations are based on CALSIM modeling runs that take into consideration SWP storage in Oroville and San Luis, “South of Delta” (SOD) Contractor demand, hydrology and operational and regulatory constraints. The allocation is typically reported as a percentage of Maximum Table A Amounts and is finalized by May 1 of the current year.

North of Delta Allocation As a result of the North of Delta Settlement (December 31, 2013), DWR issues a separate SWP Annual allocation for SCWA, Napa, and Yuba City (“the North of Delta (NOD) Contractors”), defined as the NOD Allocation. The NOD Allocation cannot exceed the Annual Table A Amounts. The NOD Allocation amounts to an additional increment of annual allocation above the current SWP Allocation. The other SOD contractors will continue to receive an allocation based on the original formula, now defined as South of Delta (SOD) Allocation.

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The concept of the NOD is to not penalize the NBA for conveyance restriction exclusive to the SOD pumping plants. Currently, DWR’s D1461 CALSIM model run is used as a surrogate for determining the NOD Allocation. All regulatory requirements under D1641 are met before allocations are met, so all contractors share in the responsibility to meet those regulatory requirements. D1641 was what the SWP operated to prior to the new ESA regulations, the 2008 and 2009 Biological Opinions. The Old-Middle River restrictions (OMR) part of the ESA regulations greatly impact the SOD pumping plant, but do not impact NOD diversions. However, the NOD allocation does provide of a share of any additional ESA outflow requirements, such as Fall X2, and Delta water quality requirements. If Delta regulations change, the NOD Allocation may be affected commensurately. Analysis performed by DWR estimated that SCWA could receive an additional 11 TAF approximately 50% of the years compared to existing Table A deliveries.1 The actual differential varies each year being less in drier years. Since the implementation of the NOD Allocation in 2014, SCWA has received an additional increment of: 0% (2014), 5% (2015), and 15% (2016 as of April 1). Note that the SWP also makes available Article 21 water that is offered to SWP contractors under specified conditions when the Delta is in excess conditions and there is pumping capacity available. SCWA receives its water from the North Bay Aqueduct (NBA). Current DWR policy is that Article 21 water is available for the NBA whenever the Delta is in Excess conditions. This makes Article 21 water available to NBA users more frequently than SWP contractors relying upon the Banks Pumping Plant (South Delta SWP export facility) capacity. For the purposes of this UWMP, Article 21 deliveries are not included although they can be a significant additional supply most years. There are numerous factors that affect the reliability of SWP supplies. The amount of the SWP water supply delivered to the state water contractors in a given year depends on the demand for the supply, amount of rainfall, snowpack, runoff, water in storage, pumping capacity from the Delta, and legal constraints on SWP operation. SWP delivery reliability depends on three general factors: 1) the availability of water at the source, 2) the ability to convey water from the source to the desired point of delivery, and 3) the magnitude of demand for the water. Another factor affecting SWP reliability is climate change. Climate change is expected to modify rainfall and runoff, which in turn will affect SWP operations. Some research suggests that global changes in climate is likely to significantly affect the hydrologic cycle, changing California’s precipitation pattern and amount from that shown by the historical record. SWP operations are closely regulated by Delta water quality standards established by the State Water Resources Control Board (SWRCB) in D-1641. In addition SWP and CVP operations are further constrained by requirements in the U.S. Fish and Wildlife Service (USFWS) and National Marine Fisheries Service (NMFS) biological opinions. Key factors in determining water quality in the western Delta are the quality of important Delta inflows and the intrusion of ocean-derived salts associated with daily tides. The models used to develop the SWP reliability data incorporate these constraints. SWP supply is not always available at a consistent level due to these environmental and political factors. Plans to replace or supplement the SWP source when there are shortages are the responsibility of SCWA

1 California Department of Water Resources State Water Project Analysis Office, Initial Study/Proposed Negative Declaration State Water Project Supply Allocation Settlement Agreement. Prepared by AECOM. July 2013.

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member agencies that contract for SWP supplies. They would typically shift to other supplies such as Solano Project and groundwater (if they have rights to these supplies) or enter into purchase or exchange agreements with other Solano agencies. SCWA would also keep member agencies informed about any SWP collective programs for dry year water purchases, such as a drought water bank. SCWA would also coordinate any joint local efforts to secure short term water supplies under a drought conditions. Increased demand management measures would be the responsibility of the member agencies to implement.

2014 SWP Water Supply Allocation The extremely dry sequence from the beginning of January 2013 through the end of 2014 was one of the driest two-year periods in the historical record. Water year 2013 was a year with two hydrologic extremes. October through December 2012 was one of the wettest fall periods on record, but was followed by the driest consecutive 12 months on record. Accordingly, the 2013 State Water Project (SWP) supply allocation was a low 35% of SWP Table A Amounts. The 2013 hydrology ended up being even drier than DWR’s conservative hydrologic forecast, so the SWP began 2014 with reservoir storage lower than targeted levels and less stored water available for 2014 supplies. Compounding this low storage situation, 2014 also was an extremely dry year, with runoff for water year 2014 the fourth driest on record. Due to extraordinarily dry conditions in 2013 and 2014, the 2014 SWP water supply allocation was a historically low 5% of Table A Amounts. The dry hydrologic conditions that led to the low 2014 SWP water supply allocation were extremely unusual, and to date have not been included in the SWP delivery estimates presented in DWR’s 2015 Delivery Capability Report. It is anticipated that the hydrologic record used in the DWR model will be extended to include the period through 2014 during the next update of the model, which is expected to be completed prior to issuance of the next update to the biennial SWP Delivery Capability Report. For the reasons stated above, the SCWA UWMP uses a conservative assumption that a 5% allocation of SWP Table A Amounts represents the “worst case” scenario. Table 8A shows normal year water supply and demand for SWP supplies. The supply number was calculated by multiplying the percentage of SWP supply for a normal year by SCWA’s SWP contract amount. The SWP supply for a normal year was defined as the average of percentage supplies for all the below normal and above normal years in the Sacramento Valley Index from 1922 through 2003. The supply total includes an adjustment for North of Delta as an additional percentage of SCWA’s Table A Allotment. In Tables 8A-C, demand was assumed to be the full SWP contract amounts. For a wholesale agency like SCWA, it is not possible to accurately predict the demand of our cumulative member agencies. Therefore, a simplifying assumption that each member unit would utilize the full amount of their contractual rights was assumed. Note, there is a deficit since the supply was assumed to be a percentage of contract amounts while demand was assumed to be the full contracted amount by each city.

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Table 8A. Projected SWP Normal Year Supply and Demand Comparison - AF/Y

2015 2020 2025 2030 2035

Supply totals 38,356 38,356 38,356 38,356 38,356 Demand totals 23,836 47,756 47,756 47,756 47,756

Difference (supply minus demand) 14,520 -9,400 -9,400 -9,400 -9,400

Difference as % of Supply 38% -25% -25% -25% -25%

Difference as % of Demand 61% -20% -20% -20% -20%

Actual 2015 demand


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Table 8B shows single dry year supply and demand comparisons. There is a deficit since the supply was assumed to be 22% of contract amounts (based on a repeat of the worst case historic single dry year of 1977) and contract amounts were assumed to be the demand. Table 8B. Projected SWP Single Dry Year Supply and Demand Comparison - AF/Y

2015 2020 2025 2030 2035


Difference (supply minus demand) -13,485 -37,405 -37,405 -37,405 -37,405

Difference as % of Supply -130% -361% -361% -361% -361%

Difference as % of Demand -57% -78% -78% -78% -78%

Actual 2015 demand Multiple dry year water supply and demand for SWP supplies from 2015-2019 is shown in Table 8C. The supply number was calculated by multiplying the percentage of SWP supply for multiple dry years by SCWA’s SWP contract amount. The SWP supply for multiple dry years was defined as the average of percentage supplies for all dry and critical years occurring in three or more consecutive years in the Sacramento Valley Index from 1922 through 2003. For Table 8C demand was assumed to be the full SWP contract amounts. Table 8C. Projected SWP Supply and Demand Comparison During a Multiple Dry Year Period Ending in 2019 - AF/Y

2015 2016 2017 2018 2019



Difference as % of Supply -302% -302% -302% -302% -302%

Difference as % of Demand -75% -75% -75% -75% -75%

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Solano Project Supply A normal year water supply and demand for Solano Project supplies is depicted in Table 9A. The supply number was calculated by multiplying the percentage of Solano Project supply for a normal year by the Solano Project contract amount. The Solano Project supply for a normal year was defined as the average of percentage supplies for all the below normal and above normal years in the Lake Berryessa Index from 1906 through 2007. The ultimate level of upstream development (for depletions in the upstream watershed) was used for these tables, not the current level of development. For the Solano Project a similar year type index was developed based upon procedures similar to the Sacramento Valley Index. A current model exists for the Solano Project that uses hydrologic records from 1906 through 2007. Using similar assumptions as the Sacramento Valley 40/30/30 Index, year types were assigned to each of the years in the Solano Project model resulting in a Lake Berryessa Index that identifies wet, normal and dry years. Results from a SCWA funded study regarding Solano Project reliability indicate the single driest year for this water source would be based on the 1934 hydrologic year. The multiple dry year period was from 1990 – 1994. For Tables 9A–C demand was assumed to be the full Solano Project contract amounts. As was the case for the SWP demand/supply projections, it is not possible for SCWA to accurately predict the demand of our cumulative member agencies. Therefore, a simplifying assumption that they would utilize the full amount of their contractual rights was made. Table 9A shows normal year supply and demand comparisons. Note, there is a deficit since the supply was assumed to be 99% of the Solano Project contract amount and demand was assumed to be the full contract amount. Table 9A. Projected Solano Project Normal Year Supply and Demand Comparison - AF/Y

2015 (1) 2020 2025 2030 2035

Supply Totals 182,605 205,825 205,825 205,825 205,825 Demand Totals 182,194 207,350 207,350 207,350 207,350

Difference (supply minus demand) 411 -1,525 -1,525 -1,525 -1,525

Difference as % of Supply 0.2% -0.7% -0.7% -0.7% -0.7%

Difference as % of Demand 0.2% -0.7% -0.7% -0.7% -0.7%

(1) 2015 Actual Deliveries The allocation process for water supplies from the Solano Project is very different than for the SWP. For the Solano Project, the contract between SCWA and USBR calls for the full contract amount to be delivered to SCWA unless it is physically impossible to deliver the water from Solano Project storage (dead storage is 10,300 AF). Therefore, the full contract water supply, 207,350 acre feet per year, is allocated until there is no water available in the reservoir. All Solano Project contractors, whether they are municipal or agricultural, are on an equal basis for Solano Project water supply.

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The main factor negatively affecting Solano Project reliability is the frequency of long droughts which could result in major drawdowns of Lake Berryessa. Environmental issues have been addressed in a legal settlement regarding downstream flows from the Solano Project and the settlement has been ratified by the State Water Resources Control Board. Limits on upstream depletions have been established through a settlement agreement administered by a court appointed Watermaster. Table 9B shows a single dry year water supply and demand projection for Solano Project supplies. The supply number was calculated by multiplying the percentage of Solano Project supply for a single dry year by the Solano Project contract amount. The Solano Project supply for a single dry year was defined as the average of percentage supplies for all single dry and critical years below normal and above normal years in the Lake Berryessa Index from 1906 through 2007. Single dry years are defined as those dry and critical years that are not consecutive plus the first dry or critical year of consecutive sequences. The ultimate level of upstream development (for depletions in the upstream watershed) was used for these tables, not the current level of development. Table 9B. Projected Solano Project Single Dry Year Supply and Demand Comparison – AF/Y

2015 2020 2025 2030 2035

Supply Totals 204,051 204,051 204,051 204,051 204,051 Demand Totals 207,350 207,350 207,350 207,350 207,350


Difference as % of Supply -1.6% -1.6% -1.6% -1.6% -1.6%

Difference as % of Demand -1.6% -1.6% -1.6% -1.6% -1.6%

For Table 9B demand was assumed to be the full Solano Project contract amounts. There is a deficit since the supply was assumed to be 98% of the Solano Project contract amount and demand was assumed to be the full contract amount. Table 9C shows multiple dry years water supply and demand for Solano Project supplies. The supply number was calculated by multiplying the percentage of Solano Project supply for multiple dry years by the Solano Project contract amount. The Solano Project supply for multiple dry years was defined as the average of percentage supplies for all dry and critical years occurring in three or more consecutive years in the Lake Berryessa Index from 1906 through 2007. The ultimate level of upstream development (for depletions in the upstream watershed) was used for these tables, not the current level of development. See Appendix A for the analysis. The multiple dry years supply is 184,887 AF or 89% of contract amounts.

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Table 9C. Projected Solano Project Supply and Demand Comparison During Multiple Dry Year Period Ending in 2019 – AF/Y

2015 2016 2017 2018 2035



Difference as % of Supply -12.1% -12.1% -12.1% -12.1% -12.1%

Difference as % of Demand -10.8% -10.8% -10.8% -10.8% -10.8%

For Table 9C demand was assumed to be the full Solano Project contract amounts. There is a deficit since the supply was assumed to be 89% of contract amounts and contract amounts are assumed to be the demand.


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WATER SHORTAGE CONTINGENCY PLAN

Stages of Action SCWA is strictly a wholesale supplier of water, not a water utility. It is the responsibility of each of the cities within Solano County to deal with water shortages. SCWA provides coordination assistance but is not responsible for making any decisions regarding water shortages. The only exception is that SCWA retains authority to change allocations of SWP supplies water during shortages. Although there are frequent shortages in the SWP supply, SCWA has never used its authority to allocate SWP supplies during any shortages. SCWA has delivered supplies in proportion to contract amounts. The contract language is as follows: “If at any time there occurs a shortage from any cause in the quantity of project water made available to Agency so that the total quantity made available to Agency is less than the total of all quantities of project water contracted for by this member unit and other member units, Agency shall portion the project water available among all member units in such a manner as Agency shall determine to be equitable. In making such determination, Agency shall consult with all its member units as shall be guided by, but not limited to, consideration of the following factors with respect to each member unit: other supplies of water available to the member unit; the quantities of water normally used by the member unit for domestic, municipal, industrial, commercial, and other purposes, and the relative ability of the member unit to reduce the quantity of water it uses; and impact various reductions of water supply will have on the economy, public health, and welfare.” The Solano Project member agencies have executed the Solano Project Members' Agreement titled “As To Drought Measures and Water Allocation" (Drought Measures Agreement) between SID, Maine Prairie Water District, Fairfield, Vacaville, Vallejo, and Suisun City. This agreement provides a phased response to drought among the parties by triggering a planning process as Lake Berryessa drops below certain levels. The Drought Measures Agreement requires each party to reserve modest amounts of Solano Project water (five to ten percent of contract allocation annually) as Lake Berryessa drops below 800,000 acre-feet (half full). If the lake level continues to drop below 450,000 acre-feet during later years, the agreement releases the reserved water among the parties, restricted for urban use. Water transferred from agricultural to urban uses requires a payment to be negotiated at that time. If the lake level recovers to above 800,000 acre-feet, the reserved water returns to the originating party without restriction, and normal allocations resume. The Drought Measures Agreement sets forth the following provisions specifically addressing Solano Project water supply curtailments and allocations during periods of water shortage:

1. When “Storage in Lake Berryessa” (as defined above) falls below 800,000 acre-feet on December 1 of any year, SCWA and the parties to the Drought Measures Agreement will prepare a Drought Contingency Plan, containing “reasonable water conservation measures, investigation of potential emergency water supplies that could be imported without construction of new conveyance facilities, and other reasonable measures that could reduce the depletion of Storage in Lake Berryessa.” If Storage in Lake Berryessa exceeds 1.1 million acre-feet on the following April 1, the agreement provides that development of the Drought Contingency Plan will be suspended.

2. When Storage in Lake Berryessa is between 550,000 acre-feet and 800,000 acre-feet on April 1 of any year, each of the parties will forego taking at least five percent of its annual contract supply that year. If Storage in Lake Berryessa is between 450,000 acre-feet and 550,000 acre-feet on April 1,

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each of the parties will forego taking at least ten percent of its annual contract supply. The unused annual contract supply will remain in Lake Berryessa under the name of the party that generated it either as “Irrigation Restricted Carryover” or “M&I Restricted Carryover,” depending on the foregone use, beginning the first day of the following water year (March 1). Each party will have established a “Restricted Carryover Account” for this purpose. For a party such as SID that delivers both irrigation water and M&I water, the Restricted Carryover will be segregated into irrigation and M&I classifications within that party’s Restricted Carryover Account. The split will be based on the amounts of each class of water acquired by the party from SCWA during the water year in which the restricted carryover was generated.

3. A party may not withdraw its Restricted Carryover until Storage in Lake Berryessa on a subsequent April 1 either exceeds 800,000 acre-feet or falls below 450,000 acre-feet. If the April 1 storage exceeds 800,000 acre-feet, then normal annual contract allocations resume and each party’s Restricted Carryover coverts to Voluntary Carryover with no restrictions on use. If the April 1 storage falls below 450,000 acre-feet, then (a) normal annual contract allocations resume, (b) the parties with M&I Restricted Carryover will have access to that carryover for M&I uses, and (c) the parties with Irrigation Restricted Carryover will have access to that carryover, but only for M&I uses or voluntary sale to other parties for M&I uses. Any Irrigation Restricted Carryover not used or sold will remain as Irrigation Restricted Carryover, and such water’s disposition will be determined by the April 1 Storage in Lake Berryessa in subsequent years.

A two-stage trigger for contingency actions is shown in Table 10. Stage 1 is if there is a 25% reduction in either SWP and/or Solano Project supplies. During Stage 1 conditions, SCWA will offer to assist member agencies in any internal exchanges or transfers and also assist in securing additional water supplies from outside sources such as drought water banks or joint efforts with other water agencies to obtain supplies in dry years. Table 10. Water Supply Shortage Stages and Conditions

Stage No. Water Supply Conditions % Shortage 1 Reduction in SWP and/or Solano Project 25% 2 Reduction in SWP and/or Solano Project 50%

Stage 2 is invoked if there is a 50% reduction in SWP and/or Solano Project supplies. During Stage 2 conditions SCWA will perform the same functions in Stage 1 and will also state its willingness to consider allocations of shortages in the SWP supply as specified in the member agency agreements.

Estimate of Minimum Supply For Next Three Years SCWA has two water supply sources: the SWP and the Solano Project. These two projects have different historic dry year sequences. The three worst years for the SWP supply are 1990-1993 (See Appendix B). The three worst years for the Solano Project supply are 1932-1934 (See Appendix A). These are reflected in Table 13. Note that the use of different dry year sequences in Table 11 results in a very conservative depiction of the estimated minimum supply for the next three years as it is unlikely that extreme dry period for both the Solano Project and SWP will coincide, especially since reductions in the Solano Project is based on reservoir levels while reductions in SWP supplies are based on current year hydrologic conditions.

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Table 11. Three-Year Estimated Minimum Water Supply – AF/Year worst separate 3 year series

Source Year 1 Year 2 Year 3 Normal

State Water Project* 20,000 9,800 16,590 38,356

Solano Project 184,887 184,887 184,887 205,825

Total 204,887 194,687 201,467 243,381 *does not include Article 21 Water Note that Table 11 does not include Article 21 water that could supplement SWP supplies. As mentioned previously, the NBA contractors have access to Article 21 water on a more frequent basis than those SWP contractors relying upon the SWP Banks pumping plant.

Catastrophic Supply Interruption Plan The following discusses actions that would take place if there is a catastrophic event on either the SWP or Solano Project supplies.

Solano Project Earthquake: in the event of an earthquake, the Solano Project Emergency Response Plan is invoked. The Plan, developed in coordination with the USBR, provides a detailed response for various levels of seismic activities both at the dam site and within a specified geographical area surrounding the Solano Project. The response is first an inspection then an assessment of any potential damage. If water deliveries are unavailable from the Solano Project, water users would shift to SWP supplies and/or invoking emergency exchange agreements with other public agencies. Power Outage: The Solano Project is not dependent upon power to operate. It is a gravity system from Monticello Dam to the end of the Putah South Canal and can be operated manually. Contamination: Any detection of contamination would result in a shut-down of the Solano Project deliveries. Member agencies would switch to the SWP supply. Landslide: The Putah South Canal is susceptible to a landslide which could either block or damage the Canal’s ability to deliver water. SCWA recently invested in a $3 million project to provide an underground pipeline bypass of an area most susceptible to a landslide. However, in an event of a landslide that blocks the Putah South Canal, Solano Project city water users would shift to a SWP supply. The SWP supply would not be available to agricultural water users.

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State Water Project Earthquake: Should an earthquake result in a disruption of SWP supplies through the NBA, the member agencies would switch to Solano Project Water supplies. All the NBA water users have access to Solano Project supplies in such an emergency. Power Outage: The NBA relies upon PG&E to provide power to pump water through the NBA. Any power outage of any duration would result in the NBA not being able to provide its water supply except for the amount of water in storage in the pipeline, that is very limited. The NBA water users would shift to Solano Project supplies in this scenario. Contamination: Should there be a contamination at the intake to the NBA, the NBA would be shut-down and the member agencies would use Solano Project water until the contamination is resolved. Landslide: The NBA is an underground pipeline and therefore would not be subject to any landslide risks.

Prohibitions, Penalties and Consumption Reduction Methods SCWA is purely a water wholesaler and does not implement any of the actions contemplated in this subsection. SCWA is contractually committed to provide the available water supply from the SWP and the Solano Project to its member agencies regardless of hydrologic conditions (with the exception of having the authority to allocate NBA water supplies in a manner different than contractual amounts during a water shortage). SCWA does not have the ability to take measures to provide incentives or disincentives for water use from SCWA.

Analysis of Revenue Impacts of Reduced Sales During Shortages

Solano Project SCWA has paid off the capital debt to USBR for the Solano Project. As a result the Agency is not charged by Reclamation for the Solano Project water supply. Therefore, SCWA does not charge Solano Project member agencies for Solano Project water supply. There would be no net impact to SCWA revenues during a water shortage.

State Water Project The contract between SCWA and its SWP member agencies require full payment of water supply costs regardless of shortages. Therefore, there would be no financial impact to SCWA from shortages.

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Draft Ordinance and Use Monitoring Procedure

Solano Project As detailed in the previous section, the Solano Project Members Agreement, “As To Drought Measures and Water Allocation” provides for a reduction in the use of Solano Project water when reservoir levels are between 800,000 acre feet of storage (approximately half full) and 450,000 acre feet of storage. The Agreement requires a reduction of five to ten percent of Solano Project use during this storage level. The five to ten percent not utilized is stored in the reservoir as carryover to be made available when the storage is above 800,000 acre feet or below 450,000 acre feet.

State Water Project SCWA does have the ability to allocate SWP water to member agencies during a shortage but has not invoked this provision to date. SCWA has determined that it will consider invoking this provision at the request of a member agency on a case by case basis. No predetermined shortage allocations have been determined.

WATER QUALITY IMPACTS ON RELIABILITY

State Water Project SWP water from the NBA is of lesser quality than the Solano Project. The NBA has historically been plagued with a variety of water quality issues. Throughout the winter and early spring months the NBA experiences very high concentrations of Dissolved Organic Carbon and high turbidity. Additionally, during local storm events the NBA water quality can change dramatically over the course of a few hours, and remain poor for weeks to months at a time. More recently, the NBA has encountered Taste & Odor issues from blue-green algae during the winter months, further impacting water quality. SCWA has implemented Best Management Practices (BMPs) in the local watershed to reduce organic carbon and turbidity loading. Wells, additional irrigation piping and fencing have been installed to protect the upper watershed and control livestock. The Agency has recently completed a feasibility study to determine if an alternate intake for the NBA can be constructed. An alternate intake would provide higher reliability water by virtue of being in a location that is less susceptible to impacts caused by local runoff. The study results indicated that the project is feasible, but at a cost of $315 - $436 million, depending on the location chosen for the intake.

Solano Project Solano Project water quality is excellent for both agricultural and urban uses. During large storms there is a short period (a few days) when water is very turbid, and Solano Project diversions from Lake Solano are temporarily halted. This conditions occurs during low demand periods.

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CHAPTER 9: DEMAND MANAGEMENT MEASURES SCWA views water conservation/demand management as a critical element of any water resources strategy developed for Solano County. As indicated earlier in the Plan, in 1991 the Agency became one of the first signatories to the Memorandum of Understanding Regarding Urban Water Conservation In California (MOU) and became a member of the CUWCC. SCWA has been an active member of the CUWCC since for 20 years and hosted a Plenary and has served as Chair of the CUWCC Residential Committee. Copies of SCWA’s BMP reports are included as Appendix D. DWR requires wholesale urban water suppliers to address water demand management measures for metering, public education and outreach, water conservation program coordination, and other demand management measures that have a significant impact on water use, measured in GPCD.

Wholesale Water Agency Programs SCWA, as a wholesaler, provides financial and technical support as well as program management to its member agencies. Financially, SCWA will pay 75% of the cost for a water conservation program and the cities will divide the remaining 25%. Additionally, to the extent possible, SCWA as a wholesale water agency provides reports on BMP implementation within the service area by retail water agencies that are not signatories to the MOU. SCWA has implemented several regional conservation programs. Many programs would not be cost effective for only one city to implement but the costs become less if factored in on a county-wide basis. Currently there are regional water conservation programs directed at both residential and commercial accounts. SCWA offers rebates to homeowners for High-Efficiency Washer (HEW) installations. SCWA partners with PG&E and other Bay Area water agencies to implement a regional High-Efficiency Washing Machine (HEW) rebate program that covers all of Solano County. This program offers a total rebate of $150 for the installation of the most energy and water-efficient clothes washers. SCWA administers a program to replace high-water use toilets in multi-family and commercial accounts with High-Efficiency Toilets (HETs). The end use of water for toilet flushing is approximately 25 percent of indoor household usage. There are also many older toilets in the commercial, industrial and institutional sectors. There remains a significant amount of older high-water-use toilets that, when replaced with HETs reduce water usage by approximately 60 percent. A pilot turf replacement program that offered financial incentives to homeowners to replace turf with water-efficient landscaping was implemented during 2010. It became a full scale program the following year and has grown in scale every year since. There is also a rebate program to encourage the installation of “smart” irrigation controllers (controllers that automatically adjust to changing weather conditions). The Water Agency also manages a county-wide water conservation program directed to Commercial Industrial and Institutional (CII) accounts. SCWA began implementation in January 2007.Water audits to find leaks or water wasting practices, are offered at no cost to CII customers. Additionally SCWA offers commercial accounts the “Water Savings Incentive Program” in which SCWA will reimburse a business or other CII account as much as 50% of the costs for installing water efficient devices. Eligible accounts also have the option of replacing older, high-water use toilets with HETs. The CII water conservation program

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is regional and extends throughout Solano County. This is a joint venture between SCWA and its member units. Additionally, SCWA implements a regional residential water survey program in conjunction with its member units. Since each city would have to implement a water survey program, it was decided that conducting a regional county-wide program would be more cost-effective. This program covers the entire county and is aimed at assisting homeowners to achieve water savings and lower water bills. In 2009, SCWA began the Residential Water Assistance Program to assist residents in identifying indoor and outdoor leaks that contribute to inefficient water use. The Residential Water Assistance Program includes both an indoor and an outdoor component. The indoor portion examines possible sources of leaks; teaches the customer how to read the meter and calculate water use; and offers suggestions to improve water efficiency. The outdoor landscape survey includes a check of the irrigation system and timers for maintenance and repairs needed; estimate or measure landscaped area; develop customer irrigation schedule based on precipitation rate, local climate, irrigation system performance, and landscape conditions; review the scheduling with customer; provide information packet to customer; and provide customer with evaluation results and water savings recommendations. This program is patterned on the successful residential water survey program implemented by the City of Fairfield, which has conducted over 3,000 residential water surveys. Additionally, City of Fairfield provides training and office space for staff involved in this program. This is a regional program that SCWA administers in coordination with its member units. The Agency and its member units also cost share on this program. SCWA maintains a website, http://solanosaveswater.org/ to provide water conservation information and news. The Water Agency is also active on social media and has a Facebook page, Instagram account, Twitter account with 680 followers, and a Youtube channel. SCWA funds a number of school water education programs. Among them is WaterWays, an outdoor education program for upper elementary school students designed to build understanding, appreciation, and stewardship of a local waterway by exploring the diverse uses of the water and how these uses may be protected. The Agency also funds two non-traditional school assembly programs, ZunZun and Rock Steady Juggling. ZunZun is a performing arts group that uses music to teach students about water and environmental stewardship. Rock Steady Juggling also uses performing arts to teach students the value of water. Both methods use a fun approach to keep students engaged and more receptive to receiving the message about water.

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Appendix A Solano Project Reliability

Ultimate level of development-of Lake Berryessa watershed @ 30,000 AF/yr - 2009 Study

Lake Berryessa IndexValue Year Type

W WetN Below Normal N Above Normal D DryD Critically Dry

YearIndex Value % Full Alloc

% Full Alloc for Normal Year

(N)

% Full Alloc for Single Dry Year

(D) *

% Full Alloc for Multiple Dry Years (3 or more Dry years)

1906 W 100%1907 W 100%1908 D 100% 100%1909 W 100%1910 N 100% 100%1911 W 100%1912 D 100% 100%1913 D 100%1914 W 100%1915 W 100%1916 W 100%1917 N 100% 100%1918 D 100% 100%1919 N 100% 100%1920 D 100% 100%1921 N 100% 100%1922 N 100% 100%1923 N 100% 100%1924 D 95% 95%1925 N 95% 95%1926 N 95% 95%1927 W 95%1928 N 100% 100%1929 D 95% 95%1930 N 95% 95%1931 D 100% 100% 100%1932 D 100% 100%1933 D 45% 45%1934 D 45% 45%1935 N 100% 100%1936 N 100% 100%1937 N 100% 100%1938 W 100%1939 D 95% 95%

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1940 W 100%1941 W 100%1942 W 100%1943 N 100% 100%1944 D 100% 100%1945 N 100% 100%1946 N 100% 100%1947 D 100% 100% 100%1948 D 95% 95%1949 D 95% 95%1950 D 95% 95%1951 N 95% 95%1952 W 100%1953 N 100% 100%1954 N 100% 100%1955 D 95% 95%1956 W 100%1957 D 100% 100%1958 W 100%1959 D 100% 100%1960 N 100% 100%1961 D 100% 100%1962 N 100% 100%1963 W 100%1964 D 100% 100%1965 W 100%1966 N 100% 100%1967 W 100%1968 N 100% 100%1969 W 100%1970 W 100%1971 N 100% 100%1972 D 100% 100%1973 W 100%1974 W 100%1975 N 100% 100%1976 D 100% 100%1977 D 100%1978 W 100%1979 N 100% 100%1980 W 100%1981 D 100% 100%1982 W 100%1983 W 100%1984 N 100% 100%1985 D 100% 100%1986 W 100%1987 D 100% 100% 100%1988 D 100% 100%1989 D 100% 100%1990 D 95% 95%

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1991 N 95% 95%1992 D 90% 90%1993 W 95%1994 D 95% 95%1995 W 100%1996 W 100%1997 W 100%1998 W 100%1999 N 100% 100%2000 N 100% 100%2001 D 100% 100%2002 N 100% 100%2003 N 100% 100%2003 W 100%2004 N 100% 100%2005 N 100% 100%2006 W 100%2007 100%

Average 98% 99% 98% 89%

*Includes first year of consecutive dry years

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Appendix B State Water Project Reliability

DWR Study 2009 data - SCWA Specific

Sacramento Valley IndexValue Year Type

W WetN Below Normal N Above Normal D DryD Critically Dry

YearSacramento Valley Index % Full Table A

% Full Table A for Normal Year (N)

% Full Table A for Single Dry

Year (D) *

% Full Table A for Multiple Dry Year (3 or more

Dry years)1922 N 0.37 0.371923 N 0.84 0.841924 D 0.26 0.26 0.261925 D 0.39 0.391926 D 0.49 0.491927 W 0.461928 N 0.86 0.861929 D 0.31 0.31 0.311930 D 0.36 0.361931 D 0.22 0.221932 D 0.35 0.351933 D 0.35 0.351934 D 0.24 0.241935 N 0.43 0.431936 N 0.71 0.711937 N 0.66 0.661938 W 0.771939 D 0.96 0.961940 N 0.60 0.601941 W 0.591942 W 0.831943 W 0.771944 D 0.75 0.751945 N 0.44 0.441946 N 0.74 0.741947 D 0.74 0.741948 N 0.65 0.651949 D 0.58 0.581950 N 0.50 0.501951 N 0.43 0.431952 W 0.861953 W 0.891954 N 0.69 0.69

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1955 D 0.51 0.511956 W 0.481957 N 0.82 0.821958 W 0.581959 N 0.83 0.831960 D 0.52 0.521961 D 0.491962 N 0.70 0.701963 W 0.461964 D 0.81 0.811965 W 0.541966 N 0.83 0.831967 W 0.551968 N 0.83 0.831969 W 0.661970 W 0.581971 W 0.831972 N 0.58 0.581973 N 0.45 0.451974 W 0.781975 W 0.791976 D 0.81 0.811977 D 0.141978 N 0.45 0.451979 N 0.65 0.651980 N 0.60 0.601981 D 0.84 0.841982 W 0.571983 W 0.641984 W 0.531985 D 0.77 0.771986 W 0.671987 D 0.55 0.55 0.551988 D 0.24 0.241989 D 0.38 0.381990 D 0.42 0.421991 D 0.20 0.201992 D 0.20 0.201993 N 0.43 0.431994 D 0.67 0.671995 W 0.541996 W 0.851997 W 0.751998 W 0.911999 W 0.602000 W 0.862001 D 0.37 0.372002 D 0.422003 N 0.79 0.79

Average 0.59 0.64 0.63 0.33

*Includes first year of consecutive dry years

APPENDIX C

Single Family Residential Water Use and Conservation

Potential Pilot Study – Executive Summary

APPENDIX D

CUWCC Best Management Practices (BMP) Coverage

Report

Name: Email:

Solano County Water Agency207

[email protected] Florendo

BMP Section Monetary Amount for Financial Incentives

Monetary Amount for Equivalent Resources

BMP 3 Residential 617814 50000

BMP 4 CII 109042

BMP 5 Landscape 58400

BMP 2.1 Public Outreach 37448

BMP 2.2 School Education Program 65875

b) Technical Support

d) Water Shortage Allocation

Adoption Date: 12/5/2013

SCWA is contractually obligated to deliver the full amount of contracted water. It is the responsibility of each of the member units to deal with water shortages.

File Name:

e) Non signatory Reporting of BMP implementation by non-signatory Agencies

Solano County Water Agency does not report for non-signatories.

The Water Agency encourages its member units who are not CUWCC members to join CUWCC. The cities of Benicia, Fairfield, and Vacaville are CUWCC members. Vallejo and Suisun City are not CUWCC members but report BMP compliance

f) Encourage CUWCC Membership List Efforts to Recuit Retailers

a) Financial Investments and Building Partnerships

c) Retail Agency

Solano County Water Agency does not own or read meters. All measurements are taken by the Member Units. Since SCWA does not own, operate, or maintain any meters, we have to rely on our member units to provide water delivery data.

Comments:

0.00

At Least As effective As No

LegalYesExemption

BMP 1.1 Wholesale Agency Assistance Programs

CUWCC BMP Wholesale Coverage Report 2014

Foundational Best Managemant Practices for Urban Water Efficiency

Exempt

ON TRACK

207 Solano County Water Agency

Completed Standard Water Audit Using AWWA Software? No

AWWA File provided to CUWCC? No

AWWA Water Audit Validity Score?

Complete Training in AWWA Audit Method No

Complete Training in Component Analysis Process? No

Component Analysis? No

Repaired all leaks and breaks to the extent cost effective? No

Locate and Repar unreported leaks to the extent cost effective? No

Maintain a record keeping system for the repair of reported leaks, including time of report, leak location, type of leaking pipe segment or fitting, and leak running time from

report to repair. No

CUWCC BMP Coverage Report 2014

Foundational Best Management Practices For Urban Water Efficiency

BMP 1.2 Water Loss Control

Provided 7 Types of Water Loss Control Info

Leaks Repairs Value Real Losses

Value Apparent Losses

Miles Surveyed Press Reduction Cost Of Interventions

Water Saved (AF)

Comments:

Solano County Water Agency is strictly a wholesaler of untreated water. We do not own or maintain any meters. By agreement all functions relating to meters and leak detection is the responsibility of our member units.


LegalYesExemption

Exempt

ON TRACK

BMP 1.3 Metering With Commodity 2014

Reporting unit name Reporting unit number:

Solano County Water Agency 207

Implementation

Does your agency have any unmetered service connections? No

If YES, has your agency completed a meter retrofit plan? No

Enter the number of previously unmetered accounts fitted with meters during reporting year:

Are all new service connections being metered? Yes

Yes Are all new service connections being billed volumetrically?

Has your agency completed and submitted electronically to the Council a written plan, policy or program to test, repair and replace meters?

No

Meters Matrix

Number of CII Accounts with Mixed-use Meters

Number of CII Accounts with Mixed-use Meters Retrofitted with Dedicated Irrigation Meters during Reporting Period

Feasibility Study

Has your agency conducted a feasibility study to assess the merits of a program to provide incentives to switch mixed-use accounts to dedicated landscape meters?

No

If YES, please fill in the following information:

A. When was the Feasibility Study conducted

Describe, upload or provide an electronic link to the Feasibility Study Upload File


Exemption Yes Legal

Comments:


Exempt

ON TRACK

207 Solano County Water Agency Wholesale

The list of retail agencies your agency assists with public outreach

Description of all other Public Outreach programs

p Public Outreach Program List Number

313620

General water conservation information 5000

Flyers and/or brochures (total copies), bill stuffers, messages printed on bill, information packets

1000


Website 4800

Total 10900

Number Media Contacts Number

Radio contacts 3

Articles or stories resulting from outreach 2

News releases 5

Online Advertisings 6

Total 16

Annual Budget Category Annual Budget Amount

Public Outreach 85000

Total Amount: 85000

Does your agency perform Public Outreach programs? Yes

City of Benicia,City of Fairfield, Dept of Public Works,City of Vacaville,City of Vallejo,Solano/Suisun WA

Did at least one contact take place during each quater of the reporting year? No

Did at least one contact take place during each quater of the reporting year? Yes

Did at least one website update take place during each quater of the reporting year? Yes

Public Information Program Annual Budget

City of BeniciaCity of FairfieldCity of VacavilleSuisun City - Paul Lum, [email protected] of Dixon - Paul Lum, [email protected]

Comments:

The name of agency, contact name and email address if not CUWCC Group 1 members

CUWCC BMP Coverage Report

BMP 2.1 Public Outreach

2014


ON TRACK

Budget numbers are for fiscal year 2013/2014 - 7/1/2013 to 6/30/2014

0NoExemption




2014


ON TRACK


Materials meet state education framework requirements?

Assemblies are appropriate for Grades K-6 and meet State Content Standards in Science, Math, and Fine Arts.

Materials distributed to K-6?

We provide materials to the retail agencies to distribute the materials to the schools. We do not distribute the materials.

Materials distributed to 7-12 students? (Info Only)

Annual budget for school education program: 84450.00

Description of all other water supplier education programs

SCWA also sponsors Marine Science Institute Discovery Voyages.

City of Benicia,City of Fairfield, Dept of Public Works,City of Rio Vista,City of Vacaville,City of Vallejo,Solano/Suisun WA

YesDoes your agency implement School Education programs?


Yes

Yes

No


Comments:

0NoExemption


BMP 2.2 School Education Programs



ON TRACK

Name: Email:





BMP 2.1 Public Outreach 50000 3850

BMP 2.2 School Education Program 62430

BMP 3 Residential 231985

BMP 4 CII 218235

BMP 5 Landscape 20000




SCWA is strictly a wholesale supplier of water, not a water utility. It is the responsibility of each of the cities within Solano County to deal with water shortages. SCWA is contractually committed to deliver the full contract amount of water su

File Name:


The Water Agency does not report for non-signatories.

The Water Agency encourages its member units who are not CUWCC members to join CUWCC



c) Retail Agency

Solano County Water Agency does not own or read meters. All measurements are taken by the Member Units. Since SCWA does not own, operate, or maintain any meters, we have to rely on our member units to provide water delivery data.

Comments:


LegalYesExemption




Exempt

ON TRACK














BMP 1.2 Water Loss Control





Water Saved (AF)

Comments:



LegalYesExemption

Exempt

ON TRACK

BMP 1.3 Metering With Commodity 2013

Reporting unit name Reporting unit number:

Solano County Water Agency 207

Implementation

Does your agency have any unmetered service connections? No

If YES, has your agency completed a meter retrofit plan? No

Enter the number of previously unmetered accounts fitted with meters during reporting year:

Are all new service connections being metered? No

No Are all new service connections being billed volumetrically?

Has your agency completed and submitted electronically to the Council a written plan, policy or program to test, repair and replace meters?

No

Meters Matrix

Number of CII Accounts with Mixed-use Meters

Number of CII Accounts with Mixed-use Meters Retrofitted with Dedicated Irrigation Meters during Reporting Period

Feasibility Study

Has your agency conducted a feasibility study to assess the merits of a program to provide incentives to switch mixed-use accounts to dedicated landscape meters?

No

If YES, please fill in the following information:

A. When was the Feasibility Study conducted 1/1/0001

Describe, upload or provide an electronic link to the Feasibility Study Upload File


Exemption Yes Legal

Comments:

Water Agency does not own or operate any meters. Any functions relating to meters is the responsibility of our member units.

Exempt

ON TRACK





312944


Flyers and/or brochures (total copies), bill stuffers, messages printed on bill, information packets

1000

Website 4800


Total 10900


News releases 10


Online Advertisings 6

Total 17


Public Outreach 56000

Total Amount: 56000

Public Outreah Additional Programs

Public presentation on drought


City of Benicia,City of Fairfield, Dept of Public Works,City of Vacaville,City of Vallejo,Solano/Suisun WA





City of BeniciaCity of FairfieldCity of VacavilleSuisun City - Paul Lum, [email protected] of Dixon - Paul Lum, [email protected]

Bay Friendly




2013


ON TRACK

Budget numbers are for fiscal year 2013/2014 - 7/1/2013 to 6/30/2014

Comments:

0NoExemption




2013


ON TRACK









SCWA also sponsors Marine Science Institute Discovery Voyages.




Yes

Yes

No


Comments:

0NoExemption





ON TRACK

Name: Email:





BMP 3 Residential 105590 65500

BMP 4 CII 51265 58900

BMP 2.2 School Education Program 0 85000

BMP 2.1 Public Outreach 17500 11500



Adoption Date: 12:00:00 AM

NAFile Name:


NA

The water agency encourages its member units to join CUWCC



c) Retail Agency

Comments:


0NoExemption




ON TRACK

Name: Email:





BMP 3 Residential 365000

BMP 4 CII 520000




SCWA is contractually committed to provide the available water supply from the Solano Project to its member agencies regardless of hydrologic conditions.

File Name:


SCWA does not report for non-signatories

The water agency encourages non-CUWCC members to join the CUWCC



c) Retail Agency

Comments:


0NoExemption




ON TRACK














BMP 1.2 Water Loss Control On Track





Water Saved (AF)

Comments:

Solano CWA owns no meters or pipleines. Solano CWA only delivers raw water. Solano CWA is responsible for maintaining the Putah South Canal (PSC) of the Solano Project. PSC losses are calculated by taking measured flows (meacured by Parshall flume) a


Solano County Water Agency does not read meters. All measurements are taken by the Member Units. Since SCWA does not own, operate, or maintain any meters, we have to rely on our member units to provide water delivery data. Member units send water del

LegalNoExemption



AWWA File provided to CUWCC? Yes

Zero_AWWA_2012.xls





Repaired all leaks and breaks to the extent cost effective? Yes






BMP 1.2 Water Loss Control On Track





Water Saved (AF)

Comments:

Solano County Water Agency is strictly an untreated water wholesaler. The water agency does not own or maintain any meters. As specified n the water service contract, all meter reading and calibration is conducted by the agency's member units.


LegalYesExemption


Numbered Unmetered Accounts No

Metered Accounts billed by volume of use Yes

Number of CII Accounts with Mixed UseMeters

Conducted a feasibility study to assess merits of a program to provide incentives to switch mixed-use accounts to dedicated landscape meters?

No

Feasibility Study provided to CUWCC? No

Completed a written plan, policy or program to test, repair and replace meters

No

Comments:

Date:

Uploaded file name:

This BMP is not applicable. Solano CWA does not own any meters.

12:00:00 AM


Solano County Water Agency does not read meters. All measurements are taken by the Member Units. Since SCWA does not own, operate, or maintain any meters, we have to rely on our member units to provide water delivery data.

3NoExemption

BMP 1.3 Metering With Commodity



ON TRACK


Numbered Unmetered Accounts No

Metered Accounts billed by volume of use Yes

Number of CII Accounts with Mixed UseMeters

Conducted a feasibility study to assess merits of a program to provide incentives to switch mixed-use accounts to dedicated landscape meters?

No

Feasibility Study provided to CUWCC? No

Completed a written plan, policy or program to test, repair and replace meters

No

Comments:

Date:

Uploaded file name:

All SCWA water sales are metered – there are no unmetered connections. However, none of those meters belong to SCWA. Therefore, SCWA does not handle any operations or maintenance of the meters, that becomes the responsibility of the respective member

12:00:00 AM


3YesExemption

BMP 1.3 Metering With Commodity



On Track

207 Solano County Water Agency Wholesale Only



Agency Name ID number

City of Benicia 6291

City of Fairfield, Dept of Public Works 57

City of Vacaville 5990

City of Vallejo 6012

Solano/Suisun WA 6014


232308

Website

Newsletter articles on conservation

Newsletter articles on conservation

Total


demonstration garden 15000

public outreach materials 10000

outreach event 1000

Total Amount: 26000


Water Efficient Landscaping Workshop




Did at least one website update take place during each quater of the reporting year? No


City of Benicia , Fairfield, Vacaville, and Vallejo




2011


On Track

SCWA has a Facebook page and also sends messages via Twitter. We have 164 followers on Twitter.

Comments:


No 0Exemption



2011


On Track





155302

Website 5000

Newsletter articles on conservation 3

Total 5003



Total 2


Demonstration Garden 15000

Public Outreach Materials 10000

Conservation Showcase 1000

California Water Awareness Campain 2000

Conservation Website 7000

Total Amount: 35000


17










2012


On Track

SCWA has a Facebook page and also sends messages via Twitter.

Bay Friendly Coalition

Comments:


No 0Exemption



2012


On Track



Assemblies are appropriate for Grades K-6 and meet State Content Standards inScience, Math, and Fine Arts


Assemblies are appropriate for Grades K-6 and meet State Content Standards inScience, Math, and Fine Arts




Assemblies are appropriate for Grades K-6 and meet State Content Standards inScience, Math, and Fine Arts Assemblies are appropriate for Grades K-6 and meet State Content Standards inScience, Math, and Fine Arts SCWA also sponsors Marine Science Institute Discovery Voyages. SCWA sponsored a high school video contest in 2011. The videos depicted wise water use.

City of Benicia,City of Fairfield, Dept of Public Works,City of Gilroy,City of Rio Vista,City of Vacaville,City of Vallejo,Solano/Suisun WA



Solano/Suisun WA - Paul Lum, [email protected]

Yes

Yes

No

Comments:


Exemption 0No




On Track









Assemblies are appropriate for Grades K-6 and meet State Content Standards in Science, Math, and Fine Arts. We provide materials to the retail agencies to distribute the materials to the schools. We do not distribute the materials. SCWA also sponsors Marine Science Institute Discovery Voyages. SCWA sponsored a high school video contest in 2012. The videos depicted wise water use.




Yes

Yes

No


Comments:


Exemption 0No




On Track

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